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【简答题】
用冠词a，an或the填空。 Let's have supper at half past seven.
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反馈参考答案：
举一反三
【简答题】我国的邻国共有几个?
【单选题】When transferring solution with a pipet, the correct operation to release solution is
A.
The pipet is inserted into the receiving container and removed as soon as the solution flows out naturally
B.
The pipet is vertical and the pipet tip is against the inner wall of the receiving container. After the solution flows out naturally, stop at least 30s and then move away.
C.
The pipet is vertical and the pipet tip is against the inner wall of the receiving container. After the solution flows out naturally, stop at least 5s and then move away
D.
The pipet is vertical, the solution flows out naturally and then stops for 15s, then moves away
【简答题】输液(infusion solution)
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